[bldg-sim] Slab on grade f-factor

[Joe Huang]

Calvin,

This response is a little late, but hope it might still be of use to you.
"DOE-2 modeling tips" available on line at the LBNL Simulation Research
Group web site (http://gundog.lbl.gov) has a section on modeling underground
surfaces in DOE-2 (pp. 4-14), with several tables of recommended Perimeter
Conduction Factors (Btu/hr-F-ft of perimeter) for 88 different types of
foundations. These are based on analysis of 2-D heat transfer simulation
results I did with Lester Shen back in 1988.  Since the thermal properties
of concrete are similar to that of soil, the difference between 4" and 6"
slab is insignificant. The biggest factors are: (1) the height of the slab
above the soil, (2) the perimeter insulation thickness and depth, (3) the
existence of carpet over the slab, and (4) the assumed properties of the
soil.  What we modeled was a 6" edge, with and without carpet, and wet soil
with a conductivity of 1 Btu/ft2-hr-F.

Joe
----- Original Message -----
From: "L. Calvin van Belle" <lvanbelle at tei-engineering.com>
To: <bldg-sim at gard.com>
Sent: Friday, September 12, 2003 1:58 PM
Subject: [bldg-sim] Slab on grade f-factor


> Thank you everyone for your quick response.  I have found the ASHRAE
tables
> and none of them apply to my situation.  I have an uninsulated slab that
is
> 8" thick.  All the ASHRAE tables deal with insulated slabs or 6" slabs.
>
> Do the numbers for a 6" slab change significantly when going to an 8"
slab?
>
> Calvin
>
> ___________________________________________
> L. Calvin van Belle     Phone: 206-241-2012
> Mechanical Engineer     Fax:   206-241-3101
>        lvanbelle at tei-engineering.com
>                   T. E. I.
>
>
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